Telephone-exchange system.



A. E. LUNDELL TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED OCT. 231 1915.

1,245,478. Patented Nov. 6, 1917,

lm/enforf A/ben E. L1,? dell.

'ALBEN \EJLUN'D'ELL, ornnw YonKfN;Y.,"nss1ienon, Br nsswmvnm ab WESTERNELECTRIC coMrA'nY, inoonroanrnngn' corporation or new YORK.

: wmmem a'xmmea srsrnnc.

Specification of LettersPatent.

" Patented Nov-e, 19m.

Application filed October 23, L915. seriarno. 57,449.

To (ZZZ whom it may concern:

Be it known that I, ALBEN E. Lon-Danna citizen of the United States,residing at'N'ew 'York,'in the county of Bronx and State of New York,have invented certain new and useful Improvements in Telephone-EX-change Systems, of which thefollowing'isa full, -clear, 'concise, andexact description.

This invention relates to telephone exchange systems, and particularlyto telephone exchangesystems of the semiautomatic type.

In the installation of semi-automatic telephone systems it has been thepractice to install district and ofiice machines having groups of fiftytrunks each. This practice usually results in having an equipment whichat the time of installation is much largerthan is required to handle thetra-fiic, with the result that a large portion ofthe equipment remainsidle until the-increase in 'trafiic necessitates its being brought intouse. groups of'difl'erent sizes at the time of in- B is desirable toemploy different stallation, and these groupsought to be capable ofincrease or decrease, depending upon variations in trafiic at somefuture time. It is also desirable to be able to use any oifice key forcalling any office so that the ofiice buttons can be kept arranged inalphabetical order regardless of additional installations.

The object of this 'invention'is, therefore, to provide means forreadily altering the control of the district and oiiice registers.

The accompanying drawing illustrates the invention applied to asemi-automatic telephone system, only so much of the system being shownas is necessary for an understanding of the invention. For a detaileddescription of a telephone system to which this invention is applicable,reference'may be had to Patent No. 1,125,57 9 of J anua'ry 19.,

191:3,granted to F. R. McBerty, or to Patent 1,168,319 of January 18,1916, granted to A. E. Lundell.

In the drawingsa plurality of keys are provided, of which but threekeys, 10, 11 and 12, are shown. These keys are connected one side to theterminals of, one section of a cross-connectin I rack 18, the other sideto the terminals 0 another section "of this connecting rack. vA grou ofnine relays, of which but two, 14 an 15, are shown, are

connected one side to the terminals of the fir'st section'of thecross-connecting rack 1'3 and theot'her side 'toa rack 16. To-this rack16 is also connected' 'a start relay 17.

'T'o the' second sectionof the cross-connecting rack 18 is connected'"a. "sec'ond group *of five' relays, "of which but two, 18 andl'9,'*are --shown. The relation betweenfthefstart' re- -1aya7; the:group of reiays of which 1ft and '15 are representative, and the group"of "relays of which 18 and 19 are'representative,

is suchthatthe start' relay and j one ffom each group of'the'two groupsof relays' are always energized in series.v Also withthe nine relays-inone' group and the five "relays in-the other, it"is possible to"obtainforty- 'five different combinations of two oflices each, theforty five -difi:'erent'-combinations being obtainable-by forty -fivediflereht keys having "two conta'cts each instead of having to use fourcontacts'on eacih keyyas 'Would be the case ordin'a'riliy. The manner'ofselecting a brush and group bly-mea-ns-of a' key will now be described'in detail, as it is thought that in this -manner 'the invention will bemostclearly--understood.

An operator, having received instructions from ajsubscriber to connecthim withalnother subscriber in the-"system, for instance,

one located *in the main exchange, depresses a key representing thisexchange, =and'it is assumed-that this key is the one numbered 10 onthe'dr'awing. The depression of this key closes a'cirouit from battery,startrfelay 17, the rack 16, group relay 14, the contact in thecross-connecting rack 13, the depressed key '10, the contact in thecross-connecting rack 13, group relay 18 to ground, energizing the startrelay 17. and the grouprelays 1'4 and 18in series. The group relay motormagnet of brush register 21, conductor 25, armature and back contact ofcutoff relay 26, conductor 24, armature and front contact of start relay17 to ground. The group register 20 revolves until it reaches its sixthposition, in which position a circuit is closed from battery, cutoffrelay 23, conductor 27, contact spring 28, conductor 29, armature andfront contact of group relay 14 to ground. The cutoff relay energizingbreaks the circuit of the motor magnet of the group register, stoppingthe same in the sixth po sition. The brush register revolves until itreaches its second position, at which time a circuit is closed frombattery, cutoff relay 26, contact spring 30, conductor 31, armature andfront contact of group relay 18 to ground, The closure of this circuitenergizes the cutofi relay 26, breaking the energizing circuit for themotor magnet of the brush register, stopping the register'in its secondposition.

The cutoff relays 23 and 26 being now energized, a circuit is closedfrom battery, motor magnet of sender sequence switch 32, conductor 33,lower right contact of sequence switch spring 34, conductor 35, outerarmature and front contact of cutoff relay 23, conductor 36, armatureand front contact of cutoff relay 26, conductor 24, armature and frontcontact of start relay 17 to ground, energizing the motor magnet of thesender sequence switch 32, and moving the same from position 1 intoposition 6. In position 6 of the sender sequence switch 32 a circuit isclosed from battery, line relay 37 of the selector,conductor 38, upperleft contact'of sequence switch spring 39, stepping relay 40, conductor41, armature and back contact of the #0 counting relay, conductor 42 toground. The line relay 37 energizes, attracting its armature and closinga circuit for the motor magnet of the selector sequence switch 43 frombattery, motor magnet, conductor 44, upper left contact of sequenceswitch spring 45, conductor 46, armature and front contact of line relay37 to ground, moving the sequence switch from position 1 into position2. In position 2 a circuit is closed from battery, the brush selectingmagnet 47, upper right contact of sequence switch spring 45, conductor46, armature and front contact of line relay 37 to ground, energizingthe brush selecting magnet and tripping the proper set of brushes. Inposition 6 of the sender se quence switch 32 a circuit is closed frombattery, the #1 counting relay, armature and back contact of the #1counting relay, conductor 48, the upper right and lower left contacts ofbrush register sequence switch spring 49, conductor 50, upper rightcontact of sender sequence switch spring 51, armature and front contactof stepping relay 40 to ground. In position 2 of the selector sequenceswitch 43 a circuit is closed from ground at the interrupter 52, upperright contact of sequence switch spring 53, con- .ductor 60, to thejunction of the conductor 60 with conductor 38, shunting the circuitthrough the stepping relay 40, deenergizing of the sender sequenceswitch 32 is closed at its right armature and front contact over thefollowing circuit: battery, motor magnet, conductor 33, upper rightcontact of sequence switch spring 34, conductor 53,

right armature and front contact of the #0 counting relay to ground tomove sequence switch 32 from position 6 into position 8. In moving outof position 8, the sender sequence switch 32 breaks, at the lower andupper left contacts of sequence switch spring 59, the energizing circuitfor the counting relays, which thereupon return to normal. At the end ofthe last shunting impulse from interrupter 52, the energizing circuitfor the line relay 37 of the selector was broken, the armature of which,retracting, completed a circuit from battery, motor magnet of selectorsequence switch 43, conductor 54, upper right contact of sequence switchspring 55, conductor 56, armature and back contact of line relay 37 toground, moving the sequence switch 43 from position 2 into position 3.The sender sequence switch 52 being now in position 8, the energizingcircuit for the line relay 37 of the selector and the stepping relay 40is again completed over the path above traced.

The energization of the stepping relay 40 completes a circuit frombattery through the appropriate counting relay to the upper rightcontact of group register sequence switch spring 66, conductor 57, lowerright contact of sender sequence switch spring 51, armature and frontcontact of relay 40 to ground, preparatory to sending the impulsesnecessary for group selection.

7 The energization of the line relay 37 of the selector completed acircuit from battery, motor magnet of selector sequence switch 43,conductor 44, upper left contact of sequence switch spring 45, conductor46, armature and front contact of line relay 37 of the selector toground, moving the sequence switch 43 from position 3 into posi tion 4,in which position a circuit is closed from battery, brush selectingmagnet 58, lower right contact of sequence switch spring 45, conductor46, armature and front contact of line relay 37 to ground to select theproper group. Also in position 4 of the se quence switch 43, a circuitis closed from.

ground at the interrupter 52 to control the counting relay circuit inthe manner above described for brush selection,

What is claimed is:

1. In a telephone system, the combination with groups of relays, aregister under control of each group of said relays and keys forcontrolling said relays, of means for alternating the relation betweensaid keys 10 and said relays.

and means for shifting the control of said 5 relays by said keys.

In witness whereof, I hereunto subscribe my name this 18th day ofOctober, A. D.

ALBEN E. LUNDELL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. O.

